Hi guys I was hoping someone could help me with a noisily transmission of mine. I have 1979 f250 crew cab with a nv4500 trans put in by a previous owner. So I don't know anything about the trans, clutch, or driveshaft or what condition they are in.

The transmission makes noise. A lot of it. Mainly in 4th and 5th gear under acceleration. If I'm rolling and let off the throttle or push in the clutch it goes away. The only way I can describe the sound is it sounds like you pulled out of some mud and are accelerating down the road, and the tires are throwing mud onto the body. It sounds a lot like that.
It gets louder if I put my ear to the shifter while it's doing it. 60-65 in 5th is a different, more rattly noise. It gets louder the faster I go. It's especially loud when it's cold outside, it's also slightly more difficult to shift. As if it doesn't want to get into gear. I've kinda chalked that up to oil being cold and needing warmed up, but my drive to work is only 12 miles and it never really gets any better in cold weather. The top of the transmission will get a little warm but not much else. If it's warm outside that problem goes away, but it still makes a lot of noise.

The clutch used to make a very slight wurring sound but I can't here that anymore. Occasionly upon accelerating from a stop and releasing the clutch the truck will suddenly lurch , like I let out of the clutch to fast or gave it to much throttle. It only happens occasionally (more frequent of the truck hasn't been driven in a couple days it seems like) but I can't tell if it's a tuning issue or something with the clutch. The truck runs fine and it usually only occurs around a certain spot on clutch.
Like I said I wasn't the one who did the swap so I have no idea how many miles are on the transmission or clutch. Can anyone take a guess at what the problem could be?

The truck doesn't have ANY sound deadener, and there is a 4x8" hole where the old trans cover used to be which is covered up with carpet. So it may be a little louder in the first place. Any help would be greatly appreciated.

 

The loss of 5th gear is a common problem. But yours does not sound like that, as the complaints I found on line were simply the loss of the gear, not the noise you are talking about. I think you have bearing issues.

Pull it out and take it apart.

https://www.quad4x4.com/NV4500%205th...0Solutions.htm

 

Well that's what I was expecting. Thanks for your help.